Poster's poetry and prose have attracted widespread critical acclaim and he has won both the Cardiff Academi International Poetry Competition and the Peterloo Open Poetry Competition.
The Peterloo Group was a group of poets, artists and writers in Manchester during the latter part of the 1950s.
He was the grandson of Charles Joseph Parke of Henbury in Dorset a former High Sheriff of the county and was a great nephew of General William Parke as well as being great great grandson of the Reverend Charles Wickstead Ethelston who read the riot act at the Peterloo riots and signed the arrest for the speakers.